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CSS - Pseudo Elements

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CSS pseudo-elements are used to add special effects to some selectors. You do not need to use JavaScript or any other script to use those effects. A simple syntax of pseudo-element is as follows −

selector:pseudo-element {property: value}

CSS classes can also be used with pseudo-elements −

selector.class:pseudo-element {property: value}

The most commonly used pseudo-elements are as follows −

Sr.No. Value & Description
1

:first-line

Use this element to add special styles to the first line of the text in a selector.
2

:first-letter

Use this element to add special style to the first letter of the text in a selector.
3

:before

Use this element to insert some content before an element.
4

:after

Use this element to insert some content after an element.

The :first-line pseudo-element

The following example demonstrates how to use the :first-line element to add special effects to the first line of elements in the document.

Live Demo 
<html>
   <head>
      <style type = "text/css">
         p:first-line { text-decoration: underline; }
         p.noline:first-line { text-decoration: none; }
      </style>
   </head>

   <body>
      <p class = "noline">
         This line would not have any underline because this belongs to nline class.
      </p>
      
      <p>
         The first line of this paragraph will be underlined as defined in the 
         CSS rule above. Rest of the lines in this paragraph will remain normal. 
         This example shows how to use :first-line pseduo element to give effect 
         to the first line of any HTML element.
      </p>
   </body>
</html>

It will produce the following link −

The :first-letter pseudo-element

The following example demonstrates how to use the :first-letter element to add special effects to the first letter of elements in the document.

Live Demo 
<html>
   <head>
      <style type = "text/css">
         p:first-letter { font-size: 5em; }
         p.normal:first-letter { font-size: 10px; }
      </style>
   </head>

   <body>
      <p class = "normal">
         First character of this paragraph will be normal and will have font size 10 px;
      </p>
      
      <p>
         The first character of this paragraph will be 5em big as defined in the 
         CSS rule above. Rest of the characters in this paragraph will remain 
         normal. This example shows how to use :first-letter pseduo element 
         to give effect to the first characters  of any HTML element.
      </p>
   </body>
</html>

It will produce the following black link −

The :before pseudo-element

The following example demonstrates how to use the :before element to add some content before any element.

Live Demo 
<html>
   <head>
      <style type = "text/css">
         p:before {
            content: url(/images/bullet.gif)
         }
      </style>
   </head>

   <body>
      <p> This line will be preceded by a bullet.</p>
      <p> This line will be preceded by a bullet.</p>
      <p> This line will be preceded by a bullet.</p>
   </body>
</html>

It will produce the following black link −

The :after pseudo-element

The following example demonstrates how to use the :after element to add some content after any element.

Live Demo 
<html>
   <head>
      <style type = "text/css">
         p:after {
            content: url(/images/bullet.gif)
         }
      </style>
   </head>

   <body>
      <p> This line will be succeeded by a bullet.</p>
      <p> This line will be succeeded by a bullet.</p>
      <p> This line will be succeeded by a bullet.</p>
   </body>
</html>

It will produce the following black link −

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